q2_03

# q2_03 - EE455 Quiz2 3:15-4:30(Close book 1 page formula...

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EE455 Quiz2 4/8/2003, 3:15-4:30 (Close book, 1 page formula sheet allowed) Put and hand in answers on quiz . You may use back pages Name: ID# . Each bullet is 5 points unless stated otherwise. Problem 1 Name three advantages of digital communication over analog communication Describe how a signal with frequency not exceeding W may be sampled at the transmitter and reconstructed at the receiver. Problem 2 We want to quantize X with a probability density function 16 | | 4 ) ( x x f X - = for 4 4 - x . For a uniform quantizer with a two-bit output, draw the quantization function. For this distribution, find the average quantization error for this two-bit quantizer.

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If we require a SQNR of 20 dB, how many bits would be required? If we use a non-uniform quantizer instead, sketch the quantization function that would reduce SQNR beyond that of the uniform quantizer. Why is the SQNR reduced?
Problem 3 Describe 16PSK and its associated signal points Describe 3FSK and its associated signal points

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## This note was uploaded on 11/01/2009 for the course EEE 455 taught by Professor Hui during the Spring '09 term at ASU.

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q2_03 - EE455 Quiz2 3:15-4:30(Close book 1 page formula...

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